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I have an old model forced air furnace drum belt humidifier. I'd like to keep it running as long as it is cost effective. My manual controller has developed a problem and replacement parts are no longer made. The control knob no longer permits the humidifier to automatically turn on and off for a given outside air temperature, but can still turn the humidifier on and off. There is only one temperature setting that happens at, regardless of the outside air temperature, or the inside humidity level.

If I could install a stepper motor or some kind of mechanical rotation device that would turn the knob, thus turning it on and off, and then run electrical lines up to my desk upstairs, I could reference my humidistat upstairs to manually control the on/off state of the humidifier downstairs. Then I wouldn't have to run downstairs every 90 minutes. That would make this ultimate manually controlled humidifier situation tolerable for maybe a few more heating seasons.

What device do I need to use to rotate the knob across a 15 degree sweep?

Thanks,
 

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If the humidifier is controlled by 24 volts. Just get an Aprilaire humidistat and install it. Get the one that uses outdoor air temp to automatic change humidity setting, and you don't need to run downstairs to adjust it all the time.
 
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